cretaceous oils

例句：

1. 1. The fossils found in the Cretaceous Period are incredibly importantfor understanding Earth's history.
   在白垩纪时期发现的化石对于理解地球历史来说极其重要。
2. 2. The discovery of anew species in the Cretaceousperiod has sparked excitement among scientists.
   在白垩纪时期发现的新物种引起了科学家的兴奋。
3. 3. The CretaceousPeriod is often referred to as the"age of dinosaurs."
   白垩纪时期通常被称为“恐龙时代”。